Merge pull request #3856 from gthb/patch-1

doc: quote ** in test invocation example

Author: parrt

doc/antlr-project-testing.md

@@ -98,7 +98,7 @@ From the `runtime-testsuite` dir
 ```bash
 $ cd runtime-testsuite
 $ export MAVEN_OPTS="-Xmx1G"     # don't forget this on linux
-$ mvn -Dtest=java.** test
+$ mvn -Dtest='java.**' test
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